XTCE12 — Use of raw value for calibrator context selection

Should be able to select between calibrators by referencing raw value.

Current ContextCalibrator mechanism doesn't really solve the problem. Access to raw value requires a parameter instance ref with useCalibratedValue=false. Implementing this approach requires a separate parameter type for each parameter that switches based on raw value. It also creates a somewhat circular relationship in the sense that the behavior of the parameter type (calibrator) depends on the parameter instance.

This is duplicated from XTCE12-60

Propose to accept that the resolution in MathOperationCalibratorType for XTCE12-60 also indirectly fixes this issue.